78891119 has 2 divisors, whose sum is σ = 78891120. Its totient is φ = 78891118.

The previous prime is 78891103. The next prime is 78891143. The reversal of 78891119 is 91119887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78891119 - 2⁴ = 78891103 is a prime.

It is a super-2 number, since 2×78891119² = 12447617314144322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78891119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78891149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39445559 + 39445560.

It is an arithmetic number, because the mean of its divisors is an integer number (39445560).

Almost surely, 2^78891119 is an apocalyptic number.

78891119 is a deficient number, since it is larger than the sum of its proper divisors (1).

78891119 is an equidigital number, since it uses as much as digits as its factorization.

78891119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 44.

The square root of 78891119 is about 8882.0672706302. The cubic root of 78891119 is about 428.8868250676.

The spelling of 78891119 in words is "seventy-eight million, eight hundred ninety-one thousand, one hundred nineteen".